sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) with varying mineral impurities
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown, earthy tan, and translucent white/grey; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Trigonal; Specific gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Reddish-brown, earthy tan, and translucent white/grey
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown, earthy tan, and translucent white/grey; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Trigonal; Specific gravity: 2.6-2.9.
Formation & geological history
Formed via the accumulation of microcrystalline quartz from volcanic ash or silica-rich water. This specimen appears water-worn (tumbled), suggesting it was found in a riverbed or coastal environment. It exhibits a brecciated or veined texture where quartz has filled fractures in the jasper host rock.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons), or as a decorative 'pocket stone' for collectors. In larger quantities, jasper can be used for ornamental stone carvings.
Geological facts
Jasper is an opaque variety of chalcedony. The red and brown hues are typically caused by iron oxides (hematite or goethite). It has been used since antiquity for cylinder seals and amulets.
Field identification & locations
Identify by its opacity (in the red/brown areas) and its ability to scratch glass. It is commonly found in gravel pits, riverbeds, and beaches across the Western United States and India. Collectors should look for unique banding or 'picture' patterns.
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